Casting chilled mold-boards



2 Sheets-Sheet 1.

model.)

B. B. HARRIS. v "Casting Chilled Mold-Boards.

Patented May 25, 18 80.

WITNESSE$ N PETERS, PHOTO-LITHOGRAPHE 2 Sheets-S he=et 2,

- (ModSL) B. SEAR- IS.

Casting Chilled Mold-Board s,

Patented 'M 25, 3880.

WITNESSES:

ATTORNEYSL N.PETERs, FHOTO-LITHOGRAPHER. WASHINGTON. D. C

UNITED STATES a.

PATENT "OFFICE BURNETT B. HARRIS, OF SOUTH BEND, INDIANA.

CASTING CHILLED MOLD-BOARDS.

SPECIFICATION forming part of Letters Patent No. 228,064, dated May 25,1880.

Application filed March 29, 1880. (Model) To all whom it may concern:

Be it known that I, BURNETT B. HARRIS, of South Bend, in the countyofSt. Joseph and Stateof Indiana, have invented a new and usefulImprovement in (lasting Chilled Mold- Boards, of which the following isa specification.

Figure 1, Sheet 1, is a perspective View of a flask arranged for warmingthe chill. Fig. 2, Sheet 1, is a sectional elevationof theconnecting-flue, thelower part of the flask beingshown in sideelevation. Fig. 3, Sheet 2, is a sectional elevation of the flask. Fig.4, Sheet 2, is a bottom view of the lowerpart of the flask. Fig. 5,Sheet 2, is a plan view of the moldboard pattern. Fig. 6, Sheet 2, is aplan and a side view of a core-cup. Fig. 7, Sheet 2, is a cross-sectionof a core'cup shown in place.

Similar letters of reference indicate correponding parts.

The object of this invention is to enable the molder to convenientlywarm the chills, to hold the chill in place in thelower part of theflask, while allowingit to expand and contract freely, and to enable thepattern to be removed from the chill without disturbing the cores foreasting the holes in the mold-board.

The invention consists in the combination, with the lower part of theflask having an opening in its bottom, of the chill having rabbetededges and the buttons, so that the chill will be held securely in placeand allowed to expand and contract freely; also, in the combination,with the chill and the mold-board pattern, of the core-cups havingtapering holes,

so that the patterns can be removed without disturbing the bolt holecores or dies; and also in the combination, with the lower parts of theflasks having openings in their sides, of the connecting-fines, so thatthe chills of a series of flasks can all be warmed at the same time andby the same furnace, as will be hereinafter fully described. I

A represents the lower part or drag, and B is the upper part or cope, ofthe flask. In the lower part, A, of the flask is formed an opening toreceive the chill O, the edges of which are rabbeted, as shown in Fig.3, to fit loosely in the said opening. The chill G is secured to thebottom of the part A by buttons D, secured boltholes, and into the saidholes F are fitted the cups G, which are kept in place by points orflanges upon their sides to enter notches in the sides of the holes F.

In the cups G are formed tapering holes H, of the same size as therequired bolt-holes, and

The holes F are made considerably larger than the required size of thewhich are designed to be filled with green sand to form the cores forcasting the bolt-holes.

WVith this construction, when the pattern E is to be removed thecore-cups G are first taken out, leaving the sand cores resting upon thechill, so that the pattern D, however crooked it may be, can be removedwithout disturbing the sand cores.

The cups 0 may also be used for placing iron dies or cores upon thechill, in which case the dies may be stuck fast to the chill, with alittle red lead mixed with oil to prevent the saiddies from slippingoutof place.

In the sides of the lower parts, A, of the flasks are formed openings I,as shown in Figs.2 and 3, to serve as heatpassages in warming the chills0.

When the chills are to be warmed twenty flasks, (more or less,) or asmany as a man can mold in a day, are placed at a little distanceapart,and the openings I in the adjacent sides of the flasks areconnected by a connectingfiue, J, which is made with open bottom andsides, and with notches in its side edges to receive the clamps of theflasks.

The joints around the connecting-fines J and the lower parts of theflasks may be closed with sand orother packing. When thus arranged asmall furnace is connected with the opening I of the first flask and asmall upright flue is connected with the opening of the last flask, sothat the heated products of combustion from the furnace may be drawnthrough all the flasks and all the chills warm-ed at the same time, andwith a small amount of fuel.

When the chills have been sufficiently warmed the flasks are turned upontheir edges and poured in the usual manner.

The operation of castingachilled mold-board is as follows: In connectionwith the fine that connects with the furnace, place a chill and drag.Then place the mold-board pattern on the chill and, if iron dies are tobe used for making the holes for the bolt-heads, put the dies in thecups, and then both togetherin the mold-board pattern. This will bringthe large end of the die to rest upon the chill. The molding-sand is nowplaced around the moldboard pattern and rammed about the edge. The sidesof the drag are only as deep as the chill and mold-board pattern, takentogether, are thick. When the parting is made thereis a border of sandaround the mold-board pattern, where it remains. Now the parting-sand issprinkled on, and then the cope placed in position and rammed. The sprucis a round stick three-fourths of an inch in diameter, about twentyinches long, and passes down through the ring or cup at the square endof the flask, connecting with the sand iirthe drag by means of a piece,like a common loop, which is doweled to the end of the sprue, which iswithdrawn and the large end of the loop exposed, so that it may bereadily drawn. The cup is now taken from the mold-board pattern, so asto leave the dies or cores which are to form the holes for thebolt-heads resting on the chill with a clear space or ring of threeeighths of an inch around them. It is now proper to draw the mold-boardpattern, out the gate in the sand which is in the drag, close the mold,put the bottom-board on top of the cope, and clamp fast to the dray. Thechill is now ready for heating. A tightjoint must be made around andbetween the flasks with sand, connection made with the upright flue,

and the fire lighted in the furnace. In thirty or forty minutes thechills will be warm enough for casting the mold-boards. The metal is atfirst poured in at the end farthest from the furnace. After the metal isset roll the flask down away from the furnace so as to bring the chillon top. Now lift the chill and the mold-board remains embedded in thecope, where it is covered with dry sand and left until cold enough toremove. I have the chill below during the heating, so that the moisturearising therefrom may be absorbed by the superposed sand in the cope.

Having thus described my invention, I claim as new and desire to secureby Letters-Patent.-

l. The combination, with the lower part, A, of the flask having openingin its bottom, of the chill 0, having rabbeted edgesfand the buttons D,substantially as herein shown and described, whereby the chill will beheld securely in place and allowed to expand and contract freely, as setforth.

2. The combination, with the chill O and the mold-board pattern E,having tapering holes F, of the core-cups Gr, having tapering holes,substantially as herein shown and described, whereby the mold-boardpattern can be removed without disturbing the bolt-hole cores or dies,as set forth.

3. The combination, with the lower part, A, ofthe flasks, havingopenings I in their sides, of the connectin g-flues J, substantially asherein shown and described, whereby the chills of a series of flasks mayall be warmed at the same time and by the same furnace, as set forth.

BURNETT BARNY HARRIS. 'Witnesses J. U. VVALLAOE, MARY EVANS.

